How many people live in Montgomery County, OH?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 537,400 people living in Montgomery County, OH. That makes Montgomery County the fifth-most populous county in Ohio. It is home to 4.5% of people living in the state.
537K
population of Montgomery County, OH (2024)
4.5%
County share of the Ohio population (2024)
About 537,400 people lived in Montgomery County, OH in 2024.
Population estimates, 2000–2024
What are Montgomery County, OH’s age demographics?
About 103,100 Montgomery County residents are aged 65 and older in 2024. That represents 19.2% of its population. For comparison, the age group represents 19.1% of Ohio’s population and 18% in the US overall.
Another 117,800 Montgomery County residents, or 21.9% of the population, were children under 18. For comparison, the age group represents 21.7% of Ohio’s population and 21.6% in the US overall.
A higher share of Montgomery County, OH's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Montgomery County, OH’s racial and ethnic demographics?
Non-Hispanic white residents make up 67.6% of the Montgomery County, OH population, higher than the national share of 57.5%. Montgomery County also has a larger share of people identifying as non-Hispanic Black or African American (21.7%) than the US overall (12.6%).
In contrast, Montgomery County’s Hispanic population accounts for 4.6%, below the 20% nationwide, and the non-Hispanic Asian population makes up 2.7% of the county, compared with 6.5% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Montgomery County, OH has a higher share of a non-Hispanic Black or African American population than Ohio as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Montgomery County, OH is Dayton with about 136,300 residents in 2024.
Cities and towns in Montgomery County, OH ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Dayton (pt.) | 136,346 |
| 2. | Kettering (pt.) | 56,298 |
| 3. | Huber Heights (pt.) | 37,801 |
| 4. | Centerville (pt.) | 26,308 |
| 5. | Riverside | 24,472 |
| 6. | Trotwood | 23,073 |
| 7. | Harrison | 21,781 |
| 8. | Miamisburg | 20,253 |
| 9. | Vandalia | 15,013 |
| 10. | Clayton | 13,296 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
